 | | Code-only Line-tracking competition
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You can enter the WORKSHOP 3D LEGO RCX Challenge - a robot competition to be held in Seattle on October 6th - even if you don't want to travel here. There will be a "code only" line-tracking event that anyone can enter. Build a "standard robot" at (...) (24 years ago, 7-Sep-01, to lugnet.robotics, lugnet.robotics.rcx)
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| | RCX 3.0 and legOS 1.2.4
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LEGO company will release RCX 3.0 at the end of next year, it will have 6 input port and 6 output port, 20x200 dots LCD, CPU is H8/3294 with 32K ROM and 64K RAM, it has a power socket as RCX 1.0, and with a built-in speaker, you can play wav or mid (...) (24 years ago, 7-Sep-01, to lugnet.robotics.rcx, lugnet.robotics.rcx.legos)
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| | Re: Anyone know how to build a stall sensor?
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(...) Yes. I just got a rotation sensor. Trouble is that the motors could stop for a variety of reasons (like the robot isn't moving). That isn't the real reason though (I could always handle that in software). The real reason is that ever since I (...) (24 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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| | Re: Anyone know how to build a stall sensor?
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(...) Yes. I found on article on using the battery voltage to determine the same thing, i.e. more current, less volts. To do it you need replacement firmware. I use leJOS (a Java VM), I'm one if the developers, so I could go in that way. I'm going (...) (24 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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| | Re: Anyone know how to build a stall sensor?
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(...) Hi Paul, I was interested in doing the very same thing a while ago. It sure would save on sensors if the motors had their own feedback! I know (as you are probably aware also) that the current can be monitored using the cybermaster. I saw how (...) (24 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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| | Re: Anyone know how to build a stall sensor?
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I assume you have already discarded the simple approach of using a rotation sensor and detecting that it has stopped rotating. (This gives you an odometer for free!) Or if you don't have a rotation sensor, you can use the half width six hole pulley (...) (24 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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| | Re: Anyone know how to build a stall sensor?
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(...) No. I didn't know it existed. Of itself it is interesting, but I actually want to use stalls as a means of collision detection. (...) (24 years ago, 6-Sep-01, to lugnet.robotics.rcx)
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| | Re: Anyone know how to build a stall sensor?
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(...) I suppose you've already considered using the white 24 tooth clutch (looks like a gear)to limit the torque and prevent motor stalls... Jerry (24 years ago, 5-Sep-01, to lugnet.robotics.rcx)
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| | Anyone know how to build a stall sensor?
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Hi, I'd like to be able to monitor the current being drawn by a motor using the RCX (not the CyberMaster :-( ), so that I can detect stalls and possibly spins. I can't believe that this is particularly hard but I can't find any references to one on (...) (24 years ago, 5-Sep-01, to lugnet.robotics.rcx)
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| | Re: RCX IR protocol
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Hi, Juergen has done a small mistake in his example. (...) Better it should be ~f7=~11110111=00001000=08. If you want to get a little bit of math you may add every number to its complement and you will always get ff for the result. If we take (...) (24 years ago, 4-Sep-01, to lugnet.robotics.rcx)
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| | Re: RCX IR protocol
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(...) Take a look at (URL) (...) 55 ff 00 (...) complement, i.e. invert every bit separately. So for example ~f7=~11110111=00001000=10. (...) Good luck and show it to us when you are done Jürgen (24 years ago, 4-Sep-01, to lugnet.robotics.rcx)
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| | Re: RCX IR protocol
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On the page (URL) look under the description of his send command and you'll see he sends a query "10" (hex) and gets a response "ef". This value, 0xEF, is the logical not (modulus 0xFF) of the query value 0x10. The tilde means "not". Dennis (...) (24 years ago, 3-Sep-01, to lugnet.robotics.rcx)
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| | RCX IR protocol
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Hi all, I was looking at the IR protocol described at (URL) and i dont quite understand. In paricular: What is the packet header? what does the ~ mean? (eg "RCX reply opcode is always ~query opcode") I am asking because i am writing an application (...) (24 years ago, 2-Sep-01, to lugnet.robotics.rcx)
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| | Re: Non Robot uses of the RCX
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Hello, Sounds like it was an interesting project. Could you tell me what grade was your daughter in and did she use the standard RCX/Lego Software or something else? thanks (24 years ago, 1-Sep-01, to lugnet.robotics.rcx)
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| | Re: ANN: Article on dead-reckoning with a Mindstorms robot
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(...) Jerry, Thanks. I'm glad you liked the article. When I wrote it, I was hoping that other robotics enthusiasts would be able to adapt some of my techniques to their own dead-reckoning problems. It's good to see folks taking an interest in the (...) (24 years ago, 31-Aug-01, to lugnet.robotics.rcx)
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| | Re: Non Robot uses of the RCX
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My daughter's science fair project last year used an RCX and 3 light sensors to time a LEGO sled sliding down a metal ramp with a LEGO light on the opposite side of the ramp from each light sensor, she had a primitive break-beam sensor. She used the (...) (24 years ago, 1-Sep-01, to lugnet.robotics.rcx)
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| | Re: ANN: Article on dead-reckoning with a Mindstorms robot
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(...) Gary, I enjoyed reading about the project. I liked the article with all of the links to interesting backup material. The results are ...impressive! I have two questions: The subject model does not have a long fore & aft axis. Staying in the (...) (24 years ago, 31-Aug-01, to lugnet.robotics.rcx)
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| | Re: Article on dead-reckoning with a Mindstorms robot
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(...) Thanks for the kind words. The Connecticut Robotics Society (CRS) dead-reckoning contest has no special rules limiting the parts or technology used for the robot, except that it not rely on any kind of external navigation aids (such as (...) (24 years ago, 30-Aug-01, to lugnet.robotics.rcx)
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| | Re: Article on dead-reckoning with a Mindstorms robot
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Loved your article, reminds me of the great stuff the Boulette Robotics club does. I was curious why you used differential steering instead of an adder/subtractor or synchro drive, were there some rule limitations on parts you could use? "G.W. (...) (24 years ago, 30-Aug-01, to lugnet.robotics.rcx)
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| | ANN: Article on dead-reckoning with a Mindstorms robot
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I thought that those of you who are interested in using the Lego rotation sensors for dead-reckoning and navigation might find the following useful. This month's issue of the Seattle Robotics Society's "Encoder" includes an article I wrote about my (...) (24 years ago, 30-Aug-01, to lugnet.robotics.rcx)
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